RFR: 8365483: Test sun/rmi/runtime/Log/6409194/NoConsoleOutput.java sometimes fails [v2]

[David Beaumont]

> The writer field of the handler needs to be re-checked for null inside the locked region before use.

David Beaumont has updated the pull request incrementally with one additional commit since the last revision:

  Adding test (thanks Jai)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27173/files
  - new: https://git.openjdk.org/jdk/pull/27173/files/6738848b..2992350f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27173&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27173&range=00-01

  Stats: 139 lines in 1 file changed: 139 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27173.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27173/head:pull/27173

PR: https://git.openjdk.org/jdk/pull/27173